Americans still cautious about investing despite improved market

"Even with stock market highs, the majority of Americans are cautious about
investing"

As they should be, do people really want to start
investing in stocks at a time of stock market highs? Most people are rational
enough to recognize the probability of good returns from that point in time is
not high.

That being said if I was in my 20's it likely
wouldn't matter too much in the long run, better to invest money in
something!